Global Patent Index - EP 0645764 B1

EP 0645764 B1 2000-11-29 - Method and apparatus for phase modulated servo positioning in a direct access storage device

Title (en)

Method and apparatus for phase modulated servo positioning in a direct access storage device

Title (de)

Verfahren und Vorrichtung zur Positionnierung mittels Phasenmodulation in einer Speichereinheit mit direktem Zugriff

Title (fr)

Méthode et appareil pour le positionnement avec asservissement de phase modulée dans une unité de stockage à accès direct

Publication

EP 0645764 B1 (EN)

Application

EP 94480084 A

Priority

US 12595993 A

Abstract (en)

[origin: EP0645764A2] A phase modulated servo method and apparatus are provided for use in a disk file. The disk file includes at least one disk mounted for rotation about an axis and the disk has at least one disk surface for storing data. At a predefined location of the disk surface a series of servo tracks of a predetermined high gain servo pattern are written. The predetermined high gain servo pattern includes 360 DEG phase difference information within each data cylinder. The servo tracks are detected for identifying servo phase information. <IMAGE>

IPC 1-7 (main, further and additional classification)

G11B 5/55; G11B 5/596; G11B 21/10

IPC 8 full level (invention and additional information)

G11B 5/596 (2006.01); G11B 21/10 (2006.01)

CPC (invention and additional information)

G11B 5/59622 (2013.01); G11B 5/59683 (2013.01); G11B 5/59688 (2013.01)

Designated contracting state (EPC)

AT BE CH DE ES FR GB IT LI NL SE

EPO simple patent family

EP 0645764 A2 19950329; EP 0645764 A3 19960911; EP 0645764 B1 20001129; AT 197852 T 20001215; BR 9403557 A 19950620; CA 2127971 A1 19950324; CA 2127971 C 19990112; CN 1064168 C 20010404; CN 1110824 A 19951025; DE 69426345 D1 20010104; DE 69426345 T2 20010517; ES 2152972 T3 20010216; JP H07169032 A 19950704; KR 100191903 B1 19990615; SG 47385 A1 19980417; US 6426844 B1 20020730

INPADOC legal status


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2001-01-04 [REF] CORRESPONDS TO:

- Document: DE 69426345 20010104

2000-11-30 [REG CH EP] ENTRY IN THE NATIONAL PHASE

2000-11-30 [REG CH NV] NEW AGENT

- Representative's name: JULIAN DAVID WILLIAMS C/O INTERNATIONAL BUSINESS M

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